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Industry Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fee revenue and other income:          
Fee income from customers $ 25,640 $ 23,800 $ 51,014 $ 46,571  
Interest income [1] 12,137 11,782 24,113 23,202  
Interest expense 794 470 1,473 950  
Intersegment income (expense)  
Tax-equivalized pre-tax income [1] 9,520 10,211 20,008 19,604  
Goodwill 12,569 12,569 12,569 12,569 $ 12,569
Other intangible assets, net 1,775 2,217 1,775 2,217  
Total assets 1,570,305 1,593,282 1,570,305 1,593,282 $ 1,657,209
Funding Sources 1,170,524 1,173,807 1,205,441 1,169,144  
Information Services [Member]          
Fee revenue and other income:          
Fee income from customers 25,262 23,321 50,134 45,645  
Interest income [1] 5,334 5,043 10,850 9,772  
Interest expense  
Intersegment income (expense)  
Tax-equivalized pre-tax income [1] 6,068 6,360 12,802 11,816  
Goodwill 12,433 12,433 12,433 12,433  
Other intangible assets, net 1,775 2,217 1,775 2,217  
Total assets 807,571 863,562 807,571 863,562  
Funding Sources 617,287 594,102 631,022 579,321  
Banking Services [Member]          
Fee revenue and other income:          
Fee income from customers 318 355 694 679  
Interest income [1] 5,735 5,823 11,486 11,708  
Interest expense 794 470 1,473 950  
Intersegment income (expense) 486 323 948 623  
Tax-equivalized pre-tax income [1] 2,851 3,286 6,276 6,742  
Goodwill 136 136 136 136  
Other intangible assets, net  
Total assets 806,560 742,659 806,560 742,659  
Funding Sources 553,237 579,705 574,419 589,823  
Corporate Eliminations and Other [Member]          
Fee revenue and other income:          
Fee income from customers 60 124 186 247  
Interest income [1] 1,068 916 1,777 1,722  
Interest expense  
Intersegment income (expense) (486) (323) (948) (623)  
Tax-equivalized pre-tax income [1] 601 565 930 1,046  
Goodwill  
Other intangible assets, net  
Total assets (43,826) (12,939) (43,826) (12,939)  
Funding Sources  
[1] Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017. The tax-equivalent adjustment was approximately $624,000 and $1,450,000 for the Second Quarter of 2018 and 2017, respectively, and $1,311,000 and $2,871,000 for the First Half of 2018 and 2017, respectively.